Have an 01 f150 super crew 4x4 with 5.4 li shifts hard from 1st to 2nd what could be the problem please and thank you

 

In the valve body are spring loaded slider valves to dampen the fluid flow to the Servos so they don't engage is a harsh manner.
Likely a spring is broken on the second gear valve making it a harsh engagement.
Could be a sticking valve as well.
If there is no Shifter OD trouble lamp indicating an electrical fault, the above is highly suspect.
Good luck.